U.S. patent number 10,912,708 [Application Number 16/931,860] was granted by the patent office on 2021-02-09 for battery-powered percussive massage device.
This patent grant is currently assigned to Hyper Ice, Inc.. The grantee listed for this patent is Hyper Ice, Inc.. Invention is credited to Anthony Katz, Robert Marton.
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United States Patent |
10,912,708 |
Marton , et al. |
February 9, 2021 |
Battery-powered percussive massage device
Abstract
A percussive massage device includes an enclosure having a
cylindrical bore that extends along a longitudinal axis. A motor
has a rotatable shaft that rotates about a central axis
perpendicular to the longitudinal axis. A crank coupled to the
shaft includes a pivot, which is offset from the central axis of
the shaft. A transfer bracket has a first end portion coupled to
the pivot of the crank. A flexible transfer linkage has a first end
coupled to a second end portion of the transfer bracket. A piston
has a first end coupled to a second end of the transfer linkage.
The piston is constrained to move within a cylinder along the
longitudinal axis of the cylindrical bore. An applicator head has a
first end coupled to a second end of the piston and has a second
end exposed outside the cylindrical bore for application to a
person receiving treatment.
Inventors: |
Marton; Robert (Yorba Linda,
CA), Katz; Anthony (Laguna Niguel, CA) |
Applicant: |
Name |
City |
State |
Country |
Type |
Hyper Ice, Inc. |
Irvine |
CA |
US |
|
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Assignee: |
Hyper Ice, Inc. (Irvine,
CA)
|
Family
ID: |
1000005349215 |
Appl.
No.: |
16/931,860 |
Filed: |
July 17, 2020 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20200352823 A1 |
Nov 12, 2020 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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15902542 |
Feb 22, 2018 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61H
23/0254 (20130101); A61H 23/006 (20130101); A61H
2201/0153 (20130101); A61H 2201/1215 (20130101); A61H
2201/149 (20130101); A61H 2201/1669 (20130101); A61H
2201/1436 (20130101); A61H 2201/0157 (20130101) |
Current International
Class: |
A61H
23/00 (20060101); A61H 23/02 (20060101) |
Field of
Search: |
;173/217
;320/DIG.18-DIG21 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2694966 |
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101801326 |
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Oct 2012 |
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CN |
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103655142 |
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205017429 |
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205268525 |
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206381389 |
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Aug 2017 |
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May 2003 |
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KR |
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Jun 2017 |
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TW |
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2009014727 |
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Jan 2009 |
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WO |
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Primary Examiner: Stuart; Colin W
Assistant Examiner: Sul; Douglas Y
Attorney, Agent or Firm: Patterson Intellectual Property
Law, P.C. Sewell; Jerry Turner
Parent Case Text
RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser.
No. 15/902,542, filed on Feb. 22, 2018, for "Battery-Powered
Percussive Massage Device," which is incorporated herein in its
entirety.
Claims
What is claimed is:
1. A battery-powered percussive massage device comprising: a main
enclosure extending along an axis, the main enclosure having a
proximal end and a distal end, the main enclosure including a
cavity; a motor having a rotatable shaft; a reciprocation assembly
coupled to the rotatable shaft, the reciprocation assembly
including a piston, the reciprocation assembly configured to
reciprocate the piston along a reciprocation axis in response to
rotation of the rotatable shaft, the reciprocation assembly
positioned within the cavity of the main enclosure; an applicator
head having a proximal end removably attachable to the piston, and
having a distal end that extends from the distal end of the main
enclosure when the proximal end of the applicator is attached to
the piston; a handle attached to the main enclosure, the handle
comprising: a cavity, the cavity housing at least one battery and a
printed circuit board, the printed circuit board including a
battery controller that receives electrical power via a connector
and that selectively charges the at least one battery, the printed
circuit board having a mounting surface with a peripheral edge; an
outer gripping surface covering at least a portion of the handle; a
charge indication display, the charge indication display comprising
a plurality of light-emitting diodes (LEDs) positioned on the
mounting surface of the printed circuit board near the peripheral
edge of the mounting surface, the LEDs generating light responsive
to a charge condition of the at least one battery, the light
emitted outward from the LEDs toward the peripheral edge of the
printed circuit board; and an annular light transmissive ring
positioned around the handle in alignment with the LEDs to
propagate light from the LEDs to the outside of the handle.
2. The battery-powered percussive massage device of claim 1,
wherein the light transmissive ring is circular.
3. The battery-powered percussive massage device of claim 1,
wherein the light transmissive ring is translucent.
4. The battery-powered percussive massage device of claim 1,
wherein the LEDs are multi-colored LEDs.
5. The battery-powered percussive massage device of claim 4,
wherein the multi-colored LEDs are dual-color LEDs, each LED having
a green input terminal to receive a green intensity control signal
and a red input terminal to receive a red intensity control signal,
and wherein the green intensity control signal and the red
intensity control signal are selectively controlled to provide at
least four color combinations.
6. The battery-powered percussive massage device of claim 1,
wherein the outer gripping surface of the handle is
cylindrical.
7. A battery-powered percussive massage device comprising: a main
enclosure extending along an axis, the main enclosure having a
proximal end and a distal end, the main enclosure including a
cavity; a motor having a rotatable shaft; a reciprocation assembly
coupled to the rotatable shaft, the reciprocation assembly
including a piston, the reciprocation assembly configured to
reciprocate the piston along a reciprocation axis in response to
rotation of the rotatable shaft, the reciprocation assembly
positioned within the cavity of the main enclosure; an applicator
head having a proximal end removably attachable to the piston, and
having a distal end that extends from the distal end of the main
enclosure when the proximal end of the applicator is attached to
the piston; a handle having an outer gripping surface; a battery
unit housed at least partially within the handle; a printed circuit
board positioned within the handle, the printed circuit board
including a battery controller that receives electrical power via a
connector and that selectively charges the at least one battery,
the printed circuit board having a mounting surface with a
peripheral edge a charge indication display, the charge indication
display comprising a plurality of light-emitting diodes (LEDs)
positioned on the mounting surface of the printed circuit board
near the peripheral edge of the mounting surface, the LEDs
generating light responsive to a charge condition of the at least
one battery unit, the light emitted outward from the LEDs toward
the peripheral edge of the printed circuit board; and an annular
light transmissive ring positioned around the handle in alignment
with the LEDs to propagate light from the LEDs to the outside of
the handle.
8. The battery-powered percussive massage device of claim 7,
wherein the light transmissive ring is circular.
9. The battery-powered percussive massage device of claim 7,
wherein the light transmissive ring is translucent.
10. The battery-powered percussive massage device of claim 7,
wherein the LEDs are multi-colored LEDs.
11. The battery-powered percussive massage device of claim 10,
wherein the multi-colored LEDs are dual-color LEDs, each LED having
a green input terminal to receive a green intensity control signal
and a red input terminal to receive a red intensity control signal,
and wherein the green intensity control signal and the red
intensity control signal are selectively controlled to provide at
least four color combinations.
12. The battery-powered percussive massage device of claim 7,
wherein the outer gripping surface of the handle is
cylindrical.
13. A battery assembly for a battery-powered percussive massage
device comprising: an outer cover forming a cavity, the outer cover
having a first end and a second end, the first end supporting a
plurality of electrical contacts; at least one battery unit housed
within the cavity; an outer gripping surface positioned over the
outer cover; a printed circuit board secured to the outer cover,
the printed circuit board including a battery controller, the
battery controller receiving electrical power via a connector and
selectively charging the at least one battery, the printed circuit
board having a mounting surface with a peripheral edge; a charge
indication display, the charge indication display comprising a
plurality of light-emitting diodes (LEDs) positioned on the
mounting surface of the printed circuit board near the peripheral
edge of the mounting surface, the LEDs generating light responsive
to a charge condition of the at least one battery unit, the light
emitted outward from the LEDs toward the peripheral edge of the
printed circuit board; and an annular light transmissive ring
positioned around the peripheral edge of the printed circuit board
in alignment with the LEDs to propagate light from the LEDs.
14. The battery assembly of claim 13, wherein the light
transmissive ring is circular.
15. The battery assembly of claim 13, wherein the light
transmissive ring is translucent.
16. The battery assembly of claim 13, wherein the LEDs are
multi-colored LEDs.
17. The battery assembly of claim 16, wherein the multi-colored
LEDs are dual-color LEDs, each LED having a green input terminal to
receive a green intensity control signal and a red input terminal
to receive a red intensity control signal, and wherein the green
intensity control signal and the red intensity control signal are
selectively controlled to provide at least four color
combinations.
18. The battery assembly of claim 13, wherein the outer cover is
cylindrical.
Description
FIELD OF THE INVENTION
The present invention is in the field of therapeutic devices, and,
more particularly, is in the field of devices that apply percussive
massage to selected portions of a body.
BACKGROUND OF THE INVENTION
Percussive massage, which is also referred to as tapotement, is the
rapid, percussive tapping, slapping and cupping of an area of the
human body. Percussive massage is used to more aggressively work
and strengthen deep-tissue muscles. Percussive massage increases
local blood circulation and can even help tone muscle areas.
Percussive massage may be applied by a skilled massage therapist
using rapid hand movements; however, the manual force applied to
the body varies, and the massage therapist may tire before
completing a sufficient treatment regime.
Percussive massage may also be applied by electromechanical
percussive massage devices (percussive applicators), which are
commercially available. Such percussive applicators may include,
for example, an electric motor coupled to drive a reciprocating
piston within a cylinder. A variety of percussive heads may be
attached to the piston to provide different percussive effects on
selected areas of the body. Many of the known percussive
applicators are expensive, large, relatively heavy, and tethered to
an electrical power source. For example, some percussive
applicators may require users to grip the applicators with both
hands in order to control the applicators. Some percussive
applicators are relatively noisy because of the conventional
mechanisms used to convert the rotational energy of an electric
motor to the reciprocating motion of the piston.
SUMMARY OF THE INVENTION
A need exists for an electromechanical percussive massage device
that is less costly, is small, has a relatively light weight, and
is portable (e.g., untethered to an electrical power source). A
further need exists for an electromechanical percussive massage
device that is quitter (less noisy) than conventional devices.
One aspect of the embodiments disclosed herein is a percussive
massage device that includes an enclosure having a cylindrical bore
that extends along a longitudinal axis. A motor has a rotatable
shaft that rotates about a central axis perpendicular to the
longitudinal axis. A crank coupled to the shaft includes a pivot,
which is offset from the central axis of the shaft. A transfer
bracket has a first end portion coupled to the pivot of the crank.
A flexible transfer linkage has a first end coupled to a second end
portion of the transfer bracket. A piston has a first end coupled
to a second end of the transfer linkage. The piston is constrained
to move within a cylinder along the longitudinal axis of the
cylindrical bore. An applicator head has a first end coupled to a
second end of the piston and has a second end exposed outside the
cylindrical bore for application to a person receiving
treatment.
Another aspect of the embodiments disclosed herein is a percussive
massage device. The device comprises an enclosure having a
cylindrical bore. The cylindrical bore extends along a longitudinal
axis. A motor is positioned within the enclosure. The motor has a
rotatable shaft having a central axis. The central axis of the
shaft is perpendicular to the longitudinal axis of the cylindrical
bore. A crank is coupled to the shaft. The crank includes a pivot,
which is offset from the central axis of the shaft. A transfer
bracket has a first end portion coupled to the pivot of the crank.
A flexible transfer linkage has a first end coupled to a second end
portion of the transfer bracket. A piston has a first end coupled
to a second end of the transfer linkage. The piston is positioned
within the cylindrical bore of the enclosure and is constrained to
move only along the longitudinal axis of the cylindrical bore. An
applicator head has a first end coupled to a second end of the
piston. A second end of the applicator head is exposed outside the
cylindrical bore. In certain embodiments in accordance with this
aspect, the pivot of the crank is rotatable 360 degrees about the
central axis of the shaft of the motor. The pivot is substantially
aligned with the longitudinal axis of the cylindrical bore at a
first rotational position and at a second rotational position. The
first and second rotational positions are spaced apart angularly by
180 degrees. The pivot is offset from the longitudinal axis in a
first offset direction when the pivot is at a rotational position
between the first rotational position and the second rotational
position in a first angular direction with respect to the first
rotational position. The pivot is offset from the longitudinal axis
in a second offset direction when the pivot is at a rotational
position between the first rotational position and the second
rotational position in a second angular direction opposite the
first angular direction. The flexible transfer linkage is
substantially straight and is aligned with the longitudinal axis of
the cylindrical bore when the pivot of the crank is aligned with
the longitudinal axis of the central bore at the first rotational
position or at the second rotational position. The flexible
transfer linkage bends in a first direction with respect to the
longitudinal axis of the cylindrical bore when the pivot of the
crank is offset from the longitudinal axis in the first offset
direction. The flexible transfer linkage bends in a second
direction with respect to the longitudinal axis of the cylindrical
bore when the pivot of the crank is offset from the longitudinal
axis in the second offset direction. In certain embodiments, the
applicator head is removably coupled to the piston. In certain
embodiments, the flexible transfer linkage comprises resilient
rubber. In certain embodiments, the resilient rubber has a Shore
durometer hardness of approximately 50.
Another aspect of the embodiments disclosed herein is a method of
operating a percussive massage device. The method comprises
rotating a shaft of an electric motor to rotate a pivot of a crank
about a centerline of the shaft; coupling the pivot of the crank to
a first end of a flexible interconnection linkage of a
reciprocation assembly; coupling a second end of the flexible
interconnection linkage to a piston constrained to move along a
longitudinal centerline; and coupling the piston to an applicator
head wherein rotational movement of the pivot of the crank causes
reciprocation longitudinal movement of the piston and the
applicator head. In certain embodiments of the method, the
applicator head is removably coupled to the piston. In certain
embodiments of the method, the flexible transfer linkage comprises
resilient rubber. In certain embodiments of the method, the
resilient rubber has a Shore durometer hardness of approximately
50.
Another aspect of the embodiments disclosed herein is a method of
assembling a percussive massage device. The method comprises
attaching an eccentric crank to the shaft of a motor, the eccentric
crank having a pivot; coupling a first portion of a bearing holder
to the pivot of the eccentric crank; attaching a first end of a
flexible interconnection linkage to a second portion of the bearing
holder; attaching a second end of the flexible interconnection
linkage to a first end of a piston, the piston constrained to
longitudinal movement within a cylinder; and removably attaching an
applicator head to a second end of the piston. In certain
embodiments of the method, the flexible transfer linkage comprises
resilient rubber. In certain embodiments of the method, the
resilient rubber has a Shore durometer hardness of approximately
50.
BRIEF DESCRIPTIONS OF THE DRAWINGS
The foregoing aspects and other aspects of the disclosure are
described in detail below in connection with the accompanying
drawings in which:
FIG. 1 illustrates a bottom perspective view of a portable
electromechanical percussive massage applicator that is battery
powered and has a single hand grip, the view in FIG. 1 showing the
bottom, the left side and the distal end (the end facing away from
a user (not shown)) of the applicator;
FIG. 2 illustrates a top perspective view of the portable
electromechanical percussive massage applicator of FIG. 1 showing
the top, the right side and the proximal end (the end closest to a
user (not shown)) of the applicator;
FIG. 3 illustrates an exploded perspective view of the portable
electromechanical percussive massage applicator of FIG. 1, the view
showing the upper housing, a motor assembly, a reciprocation
assembly, and a lower housing with an attached battery
assembly;
FIG. 4A illustrates an enlarged proximal end view of the combined
upper and lower housing with the endcap of the housing detached and
rotated to show the interlocking features, the view further showing
a distal view of the main printed circuit board (PCB) positioned
within the endcap of the housing;
FIG. 4B illustrates a proximal view of the main PCB isolated from
the endcap of the housing;
FIG. 5 illustrates an elevational cross-sectional view of the
portable electromechanical percussive massage applicator of FIGS. 1
and 2 taken along the line 5-5 in FIG. 1, the view taken through a
set of the mated interconnecting features of the upper and lower
housings;
FIG. 6 illustrates an elevational cross-sectional view of the
portable electromechanical percussive massage applicator of FIGS. 1
and 2 taken along the line 6-6 in FIG. 1, the view taken through
the centerline of the shaft of the motor in the motor assembly of
FIG. 3;
FIG. 7 illustrates an elevational cross-sectional view of the
portable electromechanical percussive massage applicator of FIGS. 1
and 2 taken along the line 7-7 in FIG. 1, the view taken through
the longitudinal centerline of the apparatus;
FIG. 8 illustrates a top plan view of the lower housing of FIG.
3;
FIG. 9 illustrates an exploded perspective view of the lower
housing and the battery assembly of FIG. 3;
FIG. 10 illustrates an enlarged perspective view of the lower
surface of the battery assembly printed circuit board;
FIG. 11A illustrates an exploded top perspective view of the motor
assembly of FIG. 3, the view showing the upper surfaces of the
elements of the motor assembly;
FIG. 11B illustrates an exploded bottom perspective view of the
motor assembly of FIG. 3, the view of FIG. 11B similar to the view
of FIG. 11A with the elements of the motor assembly rotated to show
the lower surfaces of the elements;
FIG. 12 illustrates a bottom perspective view of the upper housing
of the percussive massage applicator viewed from the proximal
end;
FIG. 13 illustrates an exploded perspective view of the upper
housing of the percussive massage applicator corresponding to the
view of FIG. 12 showing the outer sleeve, the cylindrical mounting
sleeve and the cylinder body;
FIG. 14 illustrates an exploded perspective view of the
reciprocation assembly of FIG. 3, the reciprocation assembly
including a crank bracket, a flexible interconnection linkage, a
piston and a removably attachable application head;
FIG. 15 illustrates a cross-sectional view of the assembled
reciprocation assembly taken along the line 15-15 in FIG. 3;
FIG. 16 illustrates a plan view of the percussive massage
applicator of FIGS. 1 and 2 with the lower cover removed, the view
looking upward toward the electrical motor of the applicator, the
view in FIG. 16 showing the crank in the 12 o'clock position (as
viewed in FIG. 16) such the end of the applicator head is extended
a first distance from the housing of the applicator;
FIG. 17 illustrates a plan view of the portable electromechanical
percussive massage applicator similar to the view of FIG. 16, the
view in FIG. 17 showing the crank in the 3 o'clock position (as
viewed in FIG. 17) such the applicator head is extended a second
distance from the housing of the applicator, wherein the second
distance is greater than the first distance of FIG. 16;
FIG. 18 illustrates a plan view of the portable electromechanical
percussive massage applicator similar to the views of FIGS. 16 and
17, the view in FIG. 18 showing the crank in the 6 o'clock position
(as viewed in FIG. 18) such the applicator head is extended a third
distance from the housing of the applicator, wherein the third
distance is greater than the second distance of FIG. 17;
FIG. 19 illustrates a plan view of the portable electromechanical
percussive massage applicator similar to the views of FIGS. 16,17
and 18, the view in FIG. 19 showing the crank in the 9 o'clock
position (as viewed in FIG. 19) such the applicator head is
extended a fourth distance from the housing of the applicator,
wherein the fourth distance is substantially equal to the second
distance of FIG. 17;
FIG. 20 illustrates a left elevational view of the percussive
massage applicator of FIGS. 1 and 2 with the bullet-shaped
applicator removed and replaced with a spherical applicator;
FIG. 21 illustrates a left elevational view of the percussive
massage applicator of FIGS. 1 and 2 with the bullet-shaped
applicator removed and replaced with a convex applicator having a
larger surface area than the bullet-shaped applicator;
FIG. 22 illustrates a left elevational view of the percussive
massage applicator of FIGS. 1 and 2 with the bullet-shape
applicator removed and replaced with a two-pronged applicator
having two smaller distal surface areas;
FIG. 23 illustrates a schematic diagram of the battery controller
circuit; and
FIG. 24 illustrates a schematic diagram of the motor controller
circuit.
DESCRIPTION OF ILLUSTRATED EMBODIMENTS
As used throughout this specification, the words "upper," "lower,"
"longitudinal," "upward," "downward," "proximal," "distal," and
other similar directional words are used with respect to the views
being described. It should be understood that the percussive
massage applicator described herein can be used in various
orientations and is not limited to use in the orientations
illustrated in the drawing figures.
A portable electromechanical percussive massage applicator
("percussive massage applicator") 100 is illustrated in FIGS. 1-22.
As described below, the percussive massage applicator can be
applied to different locations of body to apply percussion to the
body to effect percussive treatment. The percussive massage
applicator is operable with removably attachable applicator heads
to vary the effect of the percussive strokes. The percussive
massage applicator operates at a plurality of speeds (e.g., three
speeds).
The portable electromechanical percussive massage applicator 100
includes a main body 110. The main body includes an upper body
portion 112 and a lower body portion 114. The two body portions
engage to form a generally cylindrical enclosure about a
longitudinal axis 116 (FIG. 2).
A generally cylindrical motor enclosure 120 extends upward from the
upper body portion 112. The motor enclosure is substantially
perpendicular to the upper body portion. The motor enclosure is
capped with a motor enclosure endcap 122. The motor enclosure and
the upper body portion house a motor assembly 124 (FIG. 3). The
upper body portion also supports a reciprocation assembly 126 (FIG.
3), which is coupled to the motor assembly as described below.
A generally cylindrical battery assembly receiving enclosure 130
extends downward from the lower body portion 114 and is
substantially perpendicular to the lower body portion. A battery
assembly 132 extends from the battery assembly receiving
enclosure.
A main body endcap 140 is positioned on a proximal end of the main
body 110. In addition to other functions described below, the main
body endcap also serves as a clamping mechanism to hold the
respective proximal ends of the upper body portion 112 and the
lower body portion 114 together. As illustrated in FIG. 4A, the
endcap includes a plurality of protrusions 142 on an inner
perimeter surface 144. The protrusions are positioned to engage a
corresponding plurality of L-shaped notches 146 on the outer
perimeters of the proximal ends of the upper body portion and the
lower body portion. In the illustrated embodiment, two notches are
formed on the upper body portion and two notches are formed on the
lower body portion. The protrusions on the endcap are inserted into
the proximal ends of the notches until seated against the distal
ends of the notches. The endcap is then twisted by a few degrees
(e.g., approximately 10 degrees) to lock the endcap to the two body
portions. A screw 148 is then inserted through a bore 150 in the
endcap to engage the lower body portion to prevent the endcap from
rotating to unlock during normal use.
As shown in FIG. 4A, the main body endcap 140 houses a motor
controller (main) printed circuit board (PCB) 160. As shown in FIG.
4B, the proximal side of the main PCB supports a central pushbutton
switch 162. The operation of the switch is described below in
connection with the electronic circuitry. As shown in FIG. 2, the
switch is surrounded on the endcap by a plurality of bores 164,
which extend perpendicularly from the outer (proximal) surface of
the endcap to form a plurality of concentric rows of bores.
Selected ones of the bores are through bores, which allow airflow
through the endcap. Three of the bores above the switch have
respective speed indication light-emitting diodes (LEDs) 166A,
166B, 166C positioned therein. The three LEDs extend from the
proximal side of the PCB as shown in FIG. 4B. The three LEDs
provide an indication of the operational state of the percussive
massage applicator 100 as described in more detail below. Five of
the bores located below the switch have respective battery charge
state LEDs 168A, 168B, 168C, 168D, 168E positioned therein. The
five LEDs also extend from the proximal side of the PCB as shown in
FIG. 4B. The five LEDs provide an indication of the charge state of
the battery when the battery assembly 132 is attached and is
providing power to the percussive massage applicator. As shown in
FIG. 4A, the distal side of the PCB supports a first plug 170,
which includes three contact pins that are connectable to the
battery assembly 132 as described below. The distal side of the PCB
also supports a second plug 172, which includes five contact pins
that are connectable to the motor assembly 124 as described
below.
As shown in FIGS. 5 and 8, a distal portion of the lower body
portion 114 includes a plurality of through bores 180 (e.g., four
through bores) that are aligned with a corresponding plurality of
through bores 182 in the upper body portion 112. When lower body
portion is attached to the upper body portion, a plurality of
interconnection screws 184 pass through the through bores in the
lower body portion and engage the through bores of the upper body
portion to further secure the two body portions together. A
plurality of plugs 186 are inserted into outer portions of the
through bores of the lower body portion to hide the ends of the
interconnection screws.
As shown in FIGS. 8 and 9, the lower body portion 114 includes a
battery assembly receiving tray 200, which is secured to the inside
of the lower body portion in alignment with the battery assembly
receiving enclosure 130. The receiving tray is secured to the lower
body portion with a plurality of screws 202 (e.g., four screws).
The receiving tray includes a plurality of leaf spring contacts
204A, 204B, 204C (e.g., three contacts), which are positioned in a
triangular pattern. The three contacts are positioned to engage a
corresponding plurality of contacts 206A, 206B, 206C, which are
positioned around the top edge of the battery assembly 132 when the
battery assembly is positioned in the battery assembly receiving
enclosure.
The battery assembly 132 includes a first battery cover half 210
and a second battery cover half 212, which enclose a battery unit
214. In the illustrated embodiment, the battery unit comprises six
4.2-volt lithium-ion battery cells connected in series to produce
an overall battery voltage of approximately 25.2 volts when fully
charged. The battery cells are commercially available from many
suppliers, such as, for example, Samsung SDI Co., Ltd., of South
Korea. The first battery cover half and the second battery cover
half snap together. The two halves are further held together by an
outer cylindrical cover 216, which also serves as a gripping
surface when the percussive massage applicator 100 is being used.
In the illustrated embodiment, the outer cover extends only over
the portion of the battery assembly that does not enter the battery
receiving enclosure 132. In the illustrated embodiment, the outer
cover comprises neoprene or another suitable material that combines
a cushioning layer with an effective gripping surface.
The upper end of the battery assembly 132 includes a first
mechanical engagement tab 220 and a second mechanical engagement
tab 222 (FIG. 6). As shown in FIG. 6, for example, when the battery
assembly is fully inserted into the battery assembly receiving
enclosure 130, the first engagement tab engages a first ledge 224
and the second engagement tab engages a second ledge 226 within the
battery assembly receiving enclosure to secure the battery assembly
within the battery assembly receiving enclosure.
The lower body portion 114 includes a mechanical button 230 in
alignment with the first engagement tab 220. When sufficient
pressure is applied to the button, the first engagement tab is
pushed away from the first ledge 224 to allow the first engagement
tab to move downward with respect to the first ledge and thereby
disengage from the ledge. In the illustrated embodiment, the
mechanical button is biased by a compression spring 232. The lower
body portion further includes an opening 234 (FIG. 6) opposite the
mechanical button. The opening allows a user to insert a fingertip
into the opening to apply pressure to disengage the second
engagement tab 222 from the second ledge 226 and at the same time
to apply downward pressure to move the second engagement tab
downward away from the second ledge and thereby move the battery
assembly 132 downward. Once disengaged in this manner, the battery
assembly is easily removed from the battery assembly receiving
enclosure 130. In the illustrated embodiment, the opening is
covered in part by a flap 236. The flap may be biased by a
compression spring 238. In alternative embodiments (not shown), a
second mechanical button may be included in place of the
opening.
The second battery cover half 212 includes an integral printed
circuit board support structure 250, which supports a battery
controller printed circuit board (PCB) 252. The battery controller
PCB is shown in more detail in FIG. 10. In addition to other
components, the battery controller PCB includes a charging power
adapter input jack 254 and an on/off switch 256. In the illustrated
embodiment, the on/off switch is a slide switch. The battery
controller PCB further supports a plurality of light-emitting
diodes (LEDs) 260 (e.g., six LEDs), which are mounted around the
periphery of the battery controller PCB. In the illustrated
embodiment, each LED is a dual-color LED (e.g., red and green),
which may be illuminated to display either color. The battery
controller PCB is mounted to a battery assembly endcap 262. A
translucent plastic ring 264 is secured between the battery
controller PCB and the battery assembly endcap such that the ring
generally aligned with the LEDs. Accordingly, light emitted by the
LEDs is emitted through the ring. As discussed below, the color of
the LEDs may be used to indicate the charged state of the battery
assembly 132. A switch actuator extender 264 is positioned on the
actuator of the slide switch and extends through the endcap to
enable the slide switch to be manipulated from the outside of the
endcap.
As illustrated in FIG. 3, the motor enclosure 120 houses the
electric motor assembly 124, which is shown in more detail in FIGS.
11A and 11B. The electric motor assembly includes a brushless DC
electric motor 310 having a central shaft 312 that rotates in
response to applied electrical energy. In the illustrated
embodiment, the electric motor is a 24-volt brushless DC motor. The
electric motor may be a commercially available motor. The diameter
and height of the motor enclosure and the mounting structures
(described below) are adaptable to receive and secure the electric
motor within the motor enclosure.
The electric motor 310 is secured to a motor mounting bracket 320
via a plurality of motor mounting screws 322. The motor mounting
bracket includes a plurality of mounting tabs 324 (e.g., four
tabs). Each mounting tab includes a central bore 326, which
receives a respective rubber grommet 330, wherein first and second
enlarged portions of the grommet are positioned on opposite
surfaces of the tab. A respective bracket mounting screw 332 having
an integral washer is passed through a respective central hole 334
in each grommet to engage a respective mounting bore 336 in the
upper body portion 112. Two of the four mounting bores are shown in
FIG. 12. The grommets serve as vibration dampers between the motor
mounting bracket and the upper body portion.
The central shaft 312 of the electric motor 310 extends through a
central opening 350 in the motor mounting bracket 320. The central
shaft engages a central bore 362 of an eccentric crank 360. The
central bore is press-fit onto the central shaft of the electric
motor or is secured to the shaft by another suitable technique
(e.g., using a setscrew).
The eccentric crank 360 has a circular disk shape. The crank has an
inner surface 364 oriented toward the electric motor and an outer
surface 366 oriented away from the electric motor. A cylindrical
crank pivot 370 is secured to or formed on the outer surface and is
offset from the central bore of the crank in a first direction by a
selected distance (e.g., 2.8 millimeters in the illustrated
embodiment). An arcuate cage 372 extends from the inner surface of
the crank and is generally positioned diametrically opposite the
crank pivot with reference to the central bore 362 of the crank. A
semi-annular weight ring 374 is inserted into the arcuate cage and
is secured therein by screws, crimping or by using another suitable
technique. The masses of the arcuate cage and the semi-annular
weight ring operate to at least partially counterbalance the mass
of the crank and the forces applied to the crank, as described
below.
As shown in FIGS. 12 and 13, the distal end of the upper body
portion 112 supports a generally cylindrical outer sleeve 400
having a central bore 402. In the illustrated embodiment, a distal
portion 406 proximate to a distal end 404 of the outer sleeve is
tapered inward toward the central bore. The outer sleeve has an
annular base 408 that is secured to the distal end of the upper
body portion by a plurality of screws 410 (e.g., three screws).
The outer sleeve 400 surrounds a generally cylindrical mounting
sleeve 420 that is secured within the outer sleeve when the outer
sleeve is secured to the upper body portion 112. The mounting
sleeve surrounds a cylinder body 422 that is clamped by the
mounting sleeve and is secured in a concentric position with
respect to the longitudinal axis 116 of the percussive massage
applicator 100. In addition to securing the cylinder body, the
mounting sleeve serves as a vibration damper to reduce vibrations
propagating from the cylinder body to the main body 110 of the
percussive massage applicator. In the illustrated embodiment, the
cylinder body has a length of approximately 25 millimeters and has
an inner bore 424, which has an inner diameter of approximately 25
millimeters. In particular, the inner diameter of the cylinder body
is at least 25 millimeters plus a selected clearance fit (e.g.,
approximately 25 millimeters plus approximately 0.2
millimeters).
As shown in FIG. 3, the percussive massage applicator 100 includes
the reciprocating assembly 126, which comprises a crank engagement
bearing holder 510, which may also be referred to as a transfer
bracket; a flexible interconnection linkage 512, which may also be
referred to as a flexible transfer linkage; a piston 514; and an
applicator head 516. The reciprocating assembly is shown in more
detail in FIGS. 14 and 15.
The crank engagement bearing holder 510 comprises a bearing housing
530 having an upper end wall 532 that defines the end of a
cylindrical cavity 534. An annular bearing 536 fits within the
cylindrical cavity. A removably attachable lower end wall 538 is
secured to the bearing housing by a plurality of screws 540 (e.g.,
two screws) to constrain the annual bearing within the cylindrical
cavity. The annular bearing includes a central bore 542 that is
sized to engage the cylindrical crank pivot 370 of the eccentric
crank 360.
The crank engagement bearing holder 510 further includes an
interconnect portion 550 that extends radially from the bearing
housing 530. The interconnect portion includes a disk-shaped
interface portion 552 having a threaded longitudinal central bore
554. The central bore is aligned with a radial line 556 directed
toward the center of bearing housing. In the illustrated
embodiment, the central bore is threaded with an 8.times.1.0 metric
external thread. The interface portion has an outer surface 558,
which is orthogonal to the radial line. The center of the outer
surface of the interface portion is approximately 31 millimeters
from the center of the bearing housing. The interface portion has
an overall diameter of approximately 28 millimeters and has a
thickness of approximately 8 millimeters. A lower portion 560 of
the interface portion may be flattened to provide clearance with
other components. Selected portions of the interface portion may be
removed to form ribs 562 to reduce the overall mass of the
interface portion.
A threaded radial bore 564 is formed in the interface portion 552.
The threaded radial bore extends from the outer perimeter of the
interface portion to the threaded longitudinal central bore 554.
The threaded radial bore has an internal thread selected to engage
a bearing holder setscrew 566 that is inserted into the third
threaded bore. The bearing holder setscrew is rotated to a selected
depth as described below.
As used herein, "flexible" in connection with the flexible
interconnection linkage 512 means that the linkage is capable of
bending without breaking. The linkage comprises a resilient rubber
material. The linkage may have a Shore A durometer hardness of
around 50; however, softer or harder materials in a medium soft
Shore hardness range of 35A to 55A may be used. The linkage is
molded or otherwise formed to have a shape similar to an hourglass.
That is, the shape of the linkage is relatively larger at each end
and relatively narrower in the middle. In the illustrated
embodiment, the linkage has a first disk-shaped end portion 570 and
a second disk-shaped end portion 572. In the illustrated
embodiment, the two end portions have similar thicknesses of
approximately 4.7 millimeters and have similar outer diameters of
approximately 28 millimeters. The material between the two end
portions tapers to middle portion 574, which has a diameter of
approximately 18 millimeters. In general, the middle portion has a
diameter that is between 50 percent and 75 percent of the diameter
of the end portions; however, the middle portion may be relatively
smaller or relatively larger to accommodate materials having a
greater hardness or a lesser hardness. The linkage has an overall
length between the outer surfaces of the two end portions of
approximately 34 millimeters. As discussed in more detail below,
the smaller diameter middle portion of the linkage allows the
linkage to flex easily between the two end portions.
A first threaded interconnect rod 580 extends from the first end
portion 570 of the flexible interconnection linkage 512. A second
threaded interconnect rod 582 extends from the second end portion
572 of the linkage. In the illustrated embodiment, the interconnect
rods are metallic and are embedded into the respective end
portions. For example, in one embodiment, the linkage is molded
around the two interconnect rods. In other embodiment, the two
interconnect rods are adhesively fixed within respective cavities
formed in the respective end portions. In a still further
embodiment, the two interconnect rods are formed as integral
threaded rubber portions of the linkage.
The first interconnect rod 580 of the flexible interconnection
linkage 512 has an external thread selected to engage with the
internal thread of the threaded longitudinal central bore 554 of
the crank engagement bearing holder 510 (e.g., an 8.times.1.0
metric external thread). When the thread of the first interconnect
rod is fully engaged with the thread of the longitudinal central
bore, the bearing holder setscrew 566 is rotated to cause the inner
end of the setscrew to engage the thread of the first interconnect
rod within the longitudinal central bore to inhibit the first
interconnect rod from rotating out of the longitudinal central
bore.
In the illustrated embodiment, the second interconnect rod 582 of
the flexible interconnection linkage 512 has an external thread
similar to the thread of the first interconnect rod 580 (e.g., an
8.times.1.0 metric external thread). In other embodiments, the
threads of the two interconnect rods may be different.
In the illustrated embodiment, the piston 514 comprises stainless
steel or another suitable material. The piston has an outer
diameter that is selected to fit snugly within the inner bore 424
of the cylinder body 422 described above. For example, the outer
diameter of the illustrated piston is no greater than approximately
25 millimeters. As discussed above, the inner diameter of the inner
bore of the cylinder body is at least 25 millimeters plus a
selected minimum clearance allowance (e.g., approximately 0.2
millimeter). Thus, with the outer diameter of the piston being no
more than 25 millimeters, the piston has sufficient clearance with
respect to the cylinder body that the piston is able to move
smoothly within the cylinder body without interference. The maximum
clearance is selected such that no significant play exists between
the two parts.
In the illustrated embodiment, the piston 514 comprises a cylinder
having an outer wall 600 that extends for a length of approximately
41.2 millimeters between a first end 602 and a second end 604. A
first bore 606 is formed in the piston for a selected distance from
the first end toward the second end. For example, in the
illustrated embodiment, the first bore has a depth (e.g., length
toward the second end) of approximately 31.2 millimeters and has a
base diameter of approximately 18.773 millimeters. A first portion
608 (FIG. 15) of the first bore is threaded to form a 20.times.1.0
metric internal thread to a depth of approximately 20 millimeters
in the first bore.
A second bore 610 (FIG. 15) is formed from the second end 604 of
the piston 514 toward the first end. The second bore has a base
diameter of approximately 6.917 millimeters and has a length
sufficient to extend the second bore to the cavity formed by the
first bore (e.g., a length of approximately 10 millimeters in the
illustrated embodiment). The second bore is threaded for its entire
length to form an internal thread in the second bore. The internal
thread of the second bore engages the external thread of the second
interconnect rod 582 of the interconnection linkage 512.
Accordingly, in the illustrated embodiment, the second bore has an
8.times.1.0 metric internal thread.
A third bore 620 is formed in the piston 514 near the second end
604 of the piston. The third threaded bore extends radially inward
from the outer wall 600 of the piston to the second threaded bore.
In the illustrated embodiment, the third bore is threaded for the
entire length of the bore. The third bore has an internal thread
selected to engage a piston setscrew 622, which is inserted into
the third threaded bore. When the external thread of the second
interconnect rod 582 of the flexible interconnection linkage 512 is
fully engaged with the internal thread of the second bore 610 of
the piston, the piston setscrew is rotated to cause the inner end
of the setscrew to engage the external thread of the second
interconnect rod within the second bore to inhibit the second
interconnect rod from rotating out of engagement with the thread of
the second bore.
The applicator head 516 of the reciprocating assembly 500 can be
configured in a variety of shapes to enable a user to apply
different types of percussive massage. The illustrated applicator
head is "bullet-shaped" and is useful for apply percussive massage
to selected relatively small surface areas of a body such as, for
example, trigger points. In the illustrated embodiment, the
applicator head comprises a medium hard to hard rubber material.
The applicator head has an overall length from a first distal
(application) end 650 to a second proximal (mounting) end 652 of
approximately 55 millimeters. The applicator head has an outer
diameter of approximately 25 millimeters for a length of
approximately 32 millimeters along a main body portion 654. An
engagement portion 656 at the proximal (mounting) end of the
applicator head has a length of approximately 11 millimeters and is
threaded for a distance of approximately 9 millimeters to form an
external 20.times.1.0 metric thread that is configured to engage
the internal thread of the first bore 606 of the piston 514. The
thread of the applicator head is removably engageable with the
thread of the piston to allow the applicator head to be removed and
replaced with a different applicator head as described below. The
distal (applicator) end of the applicator has a length of
approximately 12 millimeters and tapers from the diameter of the
main body portion (e.g., approximately 25 millimeters to a blunt
rounded portion 658 having the shape of a truncated spherical cap.
The spherical cap extends distally for approximately 3.9
millimeters. The spherical cap has a longitudinal of approximately
10 millimeters and a lateral radius of approximately 7.9
millimeters. In the illustrated embodiment, the applicator head has
a hollow cavity 660 for a portion of the length from the proximal
mounting end 652. The cavity reduces the overall mass of the
applicator head to reduce the energy required to reciprocate the
applicator head as described below.
In the illustrated embodiment, percussive massage applicator 100 is
assembled by positioning and securing the motor assembly 124 in the
upper body portion 112 as described above. A cable (not shown) from
the motor 310 in the motor assembly is connected to the five-pin
second plug 172.
After installing the motor assembly 300, the reciprocation assembly
126 is installed in the enclosure 110 by first attaching the
flexible interconnection linkage 512 to the crank engagement
bearing holder 510 by threading the first threaded interconnect rod
580 into the longitudinal central bore 554. The first threaded
interconnect rod is secured within the longitudinal central bore by
engaging the bearing holder setscrew 566 into the threaded radial
bore 564. The annular bearing 536 is installed within the
cylindrical cavity 534 of the bearing bracket and is secured
therein by positioning the lower end wall 538 over the bearing and
securing the lower end wall with the screws 548. It should be
understood that the annular bearing can be installed either before
or after the bearing bracket is attached to the flexible
linkage.
The crank engagement bearing holder 510 and the connected flexible
interconnection linkage 512 are installed by positioning the
central bore 542 of the annular bearing 536 over the cylindrical
crank pivot 370 of the eccentric crank 360 with the flexible
interconnection linkage aligned with the longitudinal axis 116. The
second threaded interconnect rod 582 is directed toward the bore
424 of the cylinder body 422 within the cylindrical outer sleeve
400 at the distal end of the percussive massage applicator 100.
The applicator head 516 is attached to the piston 514 by threading
the engagement portion 656 of the applicator head into the threaded
first portion 608 of the piston. The interconnected applicator head
and piston are then installed through the bore 424 of the cylinder
body 422 to engage the second bore 610 of the piston with the
second threaded interconnector rod 582 of the flexible
interconnection linkage 512. The interconnected applicator had and
the piston are rotated within the bore of the cylinder body to
thread the second bore of the piston onto the second threaded
interconnect rod. When the second bore and the second threaded
interconnector rod are fully engaged as shown in FIG. 7, for
example, the piston setscrew 622 is threaded into the third bore
620 of the piston to engage the threads of the second threaded
interconnect rod of the flexible linkage to secure the piston to
the flexible linkage. In the illustrated embodiment, the
interconnected threads of the piston and the second threaded
interconnect rod are configured such that the third bore of the
piston is directed generally downward as shown in FIG. 7 and is
thereby accessible to tighten the piston setscrew within the third
bore. After the piston is secured to the flexible linkage, the
applicator head may be unthreaded from the piston without
unthreading the piston from the flexible linkage to allow the
applicator head to be removed and replaced without having to remove
the piston.
After installing the reciprocation assembly 126, as described
above, the lower body portion 114 is installed by aligning the
lower body portion with the upper body portion 112 and securing the
two body portions together using the screws 184 (FIG. 5). The main
body endcap 140 is then placed over the proximal ends of the two
body portions to engage the protrusions 142 of the endcap with the
L-shaped notches 146 of the two body portions. The endcap is then
secured to prevent inadvertent removal by inserting the screw 148
through the bore 150 and into the material of the lower body
portion.
The battery assembly 132 is installed in the battery assembly
receiving enclosure 130 of the lower body portion 114 of the
percussive massage applicator 100 and electrically and mechanically
engaged as described above. The battery assembly may be charged
while installed; or the battery assembly may be charged while
removed from the percussive massage applicator.
The operation of the percussive massage applicator 100 is
illustrated in FIGS. 16-19, which are views looking up at the motor
assembly in the upper body portion 112 with the lower cover 114 and
the battery assembly 132 removed. In FIG. 16, the eccentric crank
360 attached to the shaft 312 of the motor 310 is shown at a first
reference position, which is designated as the 12 o'clock position.
In this first reference position, the cylindrical crank pivot 370
on the outer surface 366 of the eccentric crank is at a most
proximal location (nearest the top of the illustration in FIG. 16).
The crank pivot is positioned in alignment with the longitudinal
axis 116. The crank engagement bearing holder 510, the flexible
interconnection linkage 512, the piston 514 and the applicator head
516 are all aligned with the longitudinal axis. In this first
position, the distal end of the applicator head extends by a first
distance D1 from the distal end of the outer sleeve 400.
In FIG. 17, the shaft 312 of the motor 300 has rotated the
eccentric crank 360 clockwise 90 degrees (as viewed in FIGS.
16-19). Accordingly, the cylindrical crank pivot 370 on the
eccentric crank is now positioned to the right of the shaft of the
motor at a second position designated as the 3 o'clock position.
The central bore 542 of the annular bearing 536 within the crank
engagement bearing holder 510 must move to the right because of the
engagement with the cylindrical crank pivot. The piston 514 is
constrained by the bore 424 of the cylinder body 422 (FIGS. 12-13)
to remain aligned with the longitudinal axis 116. The second end
572 of the flexible interconnection linkage 512 remains aligned
with the piston because of the second threaded interconnect rod
582. The first end 570 of the flexible interconnection linkage
remains aligned with the crank engagement bearing holder 510
because of the first threaded interconnect rod 580. The smaller
middle portion 574 of the flexible interconnection linkage allows
the flexible interconnection to bend to the right to allow the
crank engagement bearing holder to tilt to the right as shown. In
addition to moving to the right and away from the longitudinal
axis, the cylindrical crank pivot has also moved distally away from
the proximal end of the percussive massage applicator 100, which
causes the crank engagement bearing holder to also move distally.
The distal movement of the crank engagement bearing holder is
coupled to the piston via the flexible interconnector to push the
piston longitudinally within the cylinder. The longitudinal
movement of the piston causes the applicator head 516 to extend
further outward to a second distance D2 from the distal end of the
outer sleeve 400. The second distance D2 is greater than the first
distance D1.
In FIG. 18, the shaft 312 of the motor 310 has rotated the
eccentric crank 360 clockwise an additional 90 degrees to a
position designated as the 6 o'clock position. Accordingly, the
cylindrical crank pivot 370 is again aligned with the longitudinal
axis 116. The crank engagement bearing holder 510 and the flexible
interconnection linkage 512 have returned to the initial
straight-line configuration in alignment with the piston 514. The
cylindrical crank pivot has moved further from the proximal end of
the percussive massage applicator 100. Thus, the crank engagement
bearing holder and the flexible interconnection linkage push the
piston longitudinally within the bore 424 of the cylinder body 422
to cause the applicator head 516 to extend further outward to a
third distance D3 from the distal end of the outer sleeve 400. The
third distance D3 is greater than the second distance D2.
In FIG. 19, the shaft 312 of the motor 310 has rotated the
eccentric crank 360 clockwise an additional 90 degrees.
Accordingly, the cylindrical crank pivot 370 is now positioned to
the left of the shaft of the motor at a fourth position designated
as the 9 o'clock position. The piston 514 is constrained by the
bore 424 of the cylinder body 422 to remain aligned with the
longitudinal axis 116. The smaller middle portion 574 of the
flexible interconnection linkage 512 allows the flexible
interconnection linkage to bend to the left to allow the crank
engagement bearing holder 510 to tilt to the left as shown. In
addition to moving to the left and away from the longitudinal axis,
the cylindrical crank pivot has also moved proximally toward the
proximal end of the percussive massage applicator 100. The proximal
movement pulls the piston longitudinally within the cylinder to
cause the applicator head 516 to retreat proximally to a fourth
distance D4 from the distal end of the outer sleeve 400. The fourth
distance D4 is less than the third distance D2 and is substantially
the same as the second distance D2.
A further rotation of the shaft 312 of the motor 310 by an
additional 90 degrees clockwise returns the eccentric crank 360 to
the original 12 o'clock position shown in FIG. 16 to return the
cylindrical crank pivot 370 to the most proximal location. This
further rotation causes the distal end of the applicator head 516
to retreat to the original first distance D1 from the outer sleeve
400. Continued rotation of the shaft of the motor causes the distal
end of the applicator head to repeatedly extend and retreat with
respect to the outer sleeve. By placing the distal end of the
applicator head on a body part to be massaged, the applicator head
applies percussive treatment to the selected body part.
In the illustrated embodiment, the axis of the cylindrical crank
pivot 370 is located approximately 2.8 millimeters from the axis of
the shaft 312 of the motor 310. Accordingly, the cylindrical crank
pivot moves a total longitudinal distance of approximately 5.6
millimeters from the 12 o'clock position of FIG. 16 to the 6
o'clock position of FIG. 18. This results in a 5.6-millimeter
stroke distance of the distal end of the applicator head 516 from
the fully retreated first distance D1 to the fully extended third
distance D3.
Conventional linkage systems between a crank and a piston have two
sets of bearings. A first bearing (or set of bearings) couples a
first end of a drive rod to a rotating crank. A second bearing (or
set of bearings) couples a second end of a drive rod to a
reciprocating piston. When the piston reaches each of the two
extremes of the reciprocating motion, the piston must abruptly
change directions. The stresses caused by the abrupt changes in
direction are applied against the bearings at each end of the drive
rod as well as to the other components in the linkage system. The
abrupt changes of direction also tend to generate substantial
noise.
The reciprocating linkage system 126 described herein eliminates a
second bearing (or set of bearings) at the piston 514. The piston
is linked to the other components of the linkage via the flexible
interconnection linkage 512, which bends as the cylindrical crank
pivot 370 rotates about the centerline of the shaft 312 of the
motor 300. The flexible interconnect cushions the abrupt changes in
direction at each end of the piston stroke. For example, as the
applicator head 516 and the piston reverse direction from distal
movement to proximal movement at the 6 o'clock position, the
flexible interconnect may stretch by a small amount during the
transition. The stretching of the flexible interconnect reduces the
coupling of energy through the linkage system to the bearing 536
(FIG. 14) and the cylindrical crank pivot. Similarly, as the
applicator head and the piston reverse direction from proximal
movement to distal movement at the 12 o'clock position, the
flexible interconnect may compress by a small amount during the
transition. The compression of the flexible interconnect reduces
the coupling of energy though the linkage system to the bearing and
the cylindrical crank pivot. Thus, in addition to eliminating the
bearing at the piston end of the linkage system, the flexible
interconnect also reduces the stress on the bearing at the crank
end of the linkage system.
The flexible interconnection linkage 512 in the linkage assembly
126 also reduces the noise of the operating percussive massage
applicator 100. The effectively silent stretching and compressing
of the flexible interconnect when the reciprocation reverses
direction at the 6 o'clock and 12 o'clock positions, respectively,
eliminates the conventional metal-to-metal interaction that would
occur if the linkage system were coupled to the piston 514 with a
conventional bearing.
As discussed above, the bullet-shaped applicator head 516 is
removably threaded onto the piston 514. The bullet-shaped
applicator head may be unscrewed from the piston and replaced with
a spherical-shaped applicator head 700, shown in FIG. 20. A
spherical-shaped distal end portion 702 of the applicator head
extends from an applicator main body portion 704, which corresponds
to the main body portion 654 of the bullet-shaped applicator head.
The spherical-shaped applicator head includes an engagement portion
(not shown) corresponding to the engagement portion 656 of the
bullet-shaped applicator head. The spherical-shaped applicator head
may be used to apply percussive massage to larger areas of the body
to reduce the force on the treated area and to allow the angle of
application to be varied.
The bullet-shaped applicator head 516 may also be unscrewed and
replaced with a disk-shaped applicator head 720 shown in FIG. 21. A
disk-shaped distal end portion 722 of the applicator head extends
from an applicator main body portion 724, which corresponds to the
main body portion 654 of the bullet-shaped applicator head. The
disk-shaped applicator head includes an engagement portion (not
shown) corresponding to the engagement portion 656 of the
bullet-shaped applicator head. The disk-shaped applicator head may
be used to apply percussive massage to a larger area of the body to
reduce the force on the treated area.
The bullet-shaped applicator head 516 may also be unscrewed and
replaced with a Y-shaped applicator head 740 shown in FIG. 22. A
Y-shaped distal end portion 742 of the applicator head extends from
an applicator main body portion 744, which corresponds to the main
body portion 654 of the bullet-shaped applicator head. The Y-shaped
applicator head includes an engagement portion (not shown)
corresponding to the engagement portion 656 of the bullet-shaped
applicator head. The Y-shaped applicator head includes an
applicator base 750. A first finger 752 and a second finger 752
extend from the applicator base and are spaced apart as shown. The
two fingers of the Y-shaped applicator head may be used to apply
percussive massage to muscles on both sides of the spine without
applying direct pressure to the spine.
The portable electromechanical percussive massage applicator 100
may be provided with power and controlled in a variety of manners.
FIG. 23 illustrates an exemplary battery control circuit 800, which
comprises in part the circuitry mounted on the battery controller
PCB 252. In FIG. 23, previously identified elements are numbered
with like numbers as before.
The battery control circuit 800 includes the power adapter input
jack 254. In the illustrated embodiment, the input power provided
to the jack as a DC input voltage of approximately 30 volts DC.
Other voltages may be used in other embodiments. The input voltage
is provided with respect to a circuit ground reference 810. The
input voltage is applied across a voltage divider circuit
comprising a first voltage divider resistor 820 and a second
voltage divider resistor 822. The resistances of the two resistors
are selected to provide a signal voltage of approximately 5 volts
when the DC input voltage is present. The signal voltage is
provided through a high resistance voltage divider output resistor
824 as a DCIN signal.
The DC input voltage is provided through a rectifier diode 830 and
a series resistor 832 to a DC input bus 834. The rectifier diode
prevents damage to the circuitry if the polarity of the DC input
voltage is inadvertently reversed. The voltage on the DC input bus
is filtered by an electrolytic capacitor 836.
The DC input voltage on the DC input bus 834 is provided through a
10-volt Zener diode 840 and a series resistor 842 to the voltage
input of a voltage regulator 844. The input of the voltage
regulator is filtered by a filter capacitor 846. In the illustrated
embodiment, the voltage regulator is a HT7550-1 voltage regulator,
which is commercially available from Holtek Semiconductor, Inc., of
Taiwan. The voltage regulator provides an output voltage of
approximately 5 volts on a VCC bus 848, which is filtered by a
filter capacitor 850.
The voltage on the VCC bus is provided to a battery charger
controller 860. The controller receives the DCIN signal from the
voltage divider output resistor 824. The battery charger controller
is responsive to the active high state of the DCIN signal to
operate in the manner described below to control the charging of
the battery unit 214. When the DCIN signal is low to indicate that
the charging voltage is not present, the controller does not
operate.
The battery charger controller 860 provides a pulse width
modulation (PWM) output signal to the input of a buffer circuit
870, which comprises a PNP bipolar transistor 872 having a
collector connected to the circuit ground reference 810. The PNP
transistor has an emitter connected to the emitter of an NPN
bipolar transistor 874. The bases of the two transistors are
interconnected and form the input to the buffer circuit. The two
transistor bases are connected to receive the PWM output signal
from the controller. The commonly connected bases are also
connected to the commonly connected emitters via a base-emitter
resistor 876. The collector of the NPN connected to the VCC bus
848.
The commonly connected emitters of the PNP transistor 872 and the
NPN transistor 874 are connected to an anode of a protection diode
878. A cathode of the protection diode is connected to the VCC bus
848. The protection diode prevents the voltage on the commonly
connected emitters from exceeding the voltage on the VCC bus by
more than one forward diode drop (e.g., approximately 0.7 volt).
The commonly connected emitters of the two transistors are also
connected through a resistor 880 to a first terminal of a coupling
capacitor 882. A second terminal of the coupling capacitor is
connected to a gate terminal of a power metal oxide semiconductor
transistor (MOSFET) 884. In the illustrated embodiment, the MOSFET
comprises an STP9527 P-Channel Enhancement Mode MOSFET, which is
commercially available from Stanson Technology in Mountain View,
Calif. The gate terminal of the MOSFET is also connected to an
anode of a protection diode 886, which has a cathode connected a
source (S) terminal of the MOSFET. The protection diode prevents
the voltage on the gate terminal from exceeding the voltage on the
source terminal by more than the forward diode voltage of the
protection diode (e.g., approximately 0.7 volt). The gate terminal
of the MOSFET is also connected to the source terminal of the
MOSFET by a pull-up resistor 888. The source of the MOSFET is
connected to the DC input bus 834.
A drain (D) of the MOSFET 884 is connected to an input node 892 of
a buck converter 890. The buck converter further includes an
inductor 894 connected between the input node and an output node
896. The output node (also identified as VBAT) is connected to a
positive terminal of the battery unit 214. A negative terminal of
the battery unit is connected to the circuit ground 810 via a
low-resistance current sensing resistor 900. The input node is
further connected to a cathode of a free-wheeling diode 902, which
has an anode connected to the circuit ground. A first terminal of a
resistor 904 is also connected to the input node. A second terminal
of the resistor is connected to a first terminal of a capacitor
906. A second terminal of the capacitor is connected to the circuit
ground. Accordingly, a complete circuit path is provided from the
circuit ground, through the free-wheeling diode, through the
inductor, through the battery unit, and through the current sensing
resistor back to the circuit ground.
The battery charger controller 860 controls the operation of the
buck converter 890 by applying an active low pulse on the PWM
output connected to the buffer circuit 870, which responds by
pulling down the voltage on the commonly connected emitters of the
two transistors 872, 874 to a voltage near the ground reference
potential. The low transition to the ground reference potential is
coupled through the resistor 880 and the coupling capacitor 882 to
the gate terminal of the MOSFET 884 to turn on the MOSFET and
couple the DC voltage on the DC input bus 834 to the input node 892
of the buck converter 890. The DC voltage causes current to flow
though the inductor 894 to the battery unit 214 to charge the
battery unit. When the PWM signal from the battery charger
controller is turned off (returned to an inactive high state), the
MOSFET is turned off and no longer provides a DC voltage to the
input node of the buck converter; however, the current flowing in
the inductor continues to flow through the battery unit and back
through the free-wheeling diode as the inductor discharges to
continue charging the battery unit until the inductor is
discharged. The width and repetition rate of the active low pulses
generated by the battery charger controller determine the current
applied to charge the battery unit in a known manner. In the
illustrated embodiment, the PWM signal has a nominal repetition
frequency of approximately 62.5 kHz.
The battery charger controller 860 controls the width and
repetition rate of the pulses applied to the MOSFET 894 in response
to feedback signals from the battery unit 214. A battery voltage
sensing circuit 920 comprises a first voltage feedback resistor 922
and a second voltage feedback resistor 924. The two resistors are
connected in series from the output node 896 to the circuit ground
810 and are thus connected across the battery unit. A common
voltage sensing node 926 of the two resistors is connected to a
voltage sensing (VSENSE) input of the controller. The battery
charger controller monitors the voltage sensing input to determine
the voltage across the battery unit to determine when the battery
unit is at or near a maximum voltage of approximately 25.2 volts
such that the charging rate should be reduced. In the illustrated
embodiment, a filter capacitor 928 is connected from the voltage
sensing node to the circuit ground to reduce noise on the voltage
sensing node.
As described above, the negative terminal of the battery unit 214
is connected to the circuit ground 810 via the low-resistance
current sensing resistor 900, which may have a resistance of, for
example, 0.1 ohm. A voltage develops across the current sensing
resistor proportional to the current flowing through the battery
unit when charging. The voltage is provided as an input to a
current sensing (ISENSE) input of the battery charger controller
860 via a high-resistance (e.g., 20,000-ohm) resistor 930. The
current sensing input is filtered by a filter capacitor 932. The
battery charger controller monitors the current flowing through the
battery unit and thus through the current sensing resistor to
determine when the current flow decreases as the charge on the
battery unit nears a maximum charge. The battery charger controller
may also respond to a large current through the battery unit and
reduce the pulse width modulation to avoid exceeding a maximum
magnitude for the charging current.
The output node 896 of the buck converter 890 is also the positive
voltage node of the battery unit 214. The positive battery voltage
node is connected to a first terminal 940 of the on-off switch 256.
A second terminal 942 of the on-off switch is connected to a
voltage output terminal 944, which is identified as VOUT. The
voltage output terminal is connected to the first contact 206A of
the battery assembly 132. The first contact of the battery assembly
engages the first leaf spring contact 204A when the battery
assembly is inserted into the battery receiving tray 200. When the
switch is closed, the first terminal and the second terminal of the
switch are electrically connected to couple the battery voltage to
the voltage output terminal. The voltage output terminal is coupled
to an output voltage sensing circuit 950, which comprises a first
voltage divider resistor 952 and a second voltage divider resistor
954 connected in series between the voltage output terminal and the
circuit ground. A common node 956 between the two resistors is
connected to a VOUT sensing input of the battery charger controller
860. The common node is also connected to the circuit ground by a
Zener diode 958, which clamps the voltage at the common node to no
more than 4.7 volts. The resistances of the two resistors are
selected such that when the switch is closed and the output voltage
is applied to the output terminal, the voltage on the common node
and the VOUT sensing input of the controller is approximately 4.7
volts to indicate that the switch is closed and that the battery
voltage is being provided to the selected terminal of the battery
assembly.
A second contact 206B of the battery assembly 132 is connected to a
battery charge (CHRG) output signal of the battery charger
controller 860 via a signal line 960. The battery charge output
signal is an analog signal having a magnitude indicative of the
charging state of the battery unit 214. The second battery assembly
contact engages the second leaf spring contact 204B when the
battery assembly is inserted into the battery receiving tray
200.
A third contact 206C of the battery assembly 132 is connected to
the negative terminal of the battery unit 214 via a line 970 and is
identified as the battery ground (GND) that is provided to the
motor control PCB 160 as described below. Note that the battery
ground is coupled to the circuit ground by the 0.1-ohm current
sensing resistor 900. The current flowing out of the positive
terminal of the battery unit to the motor control PCB and back to
the negative terminal of the battery unit does not flow through the
current sensing resistor. The third battery assembly contact
engages the third leaf spring contact 204C when the battery
assembly is inserted into the battery receiving tray 200.
The battery charger controller 860 drives the dual-color LEDs 260
on the battery controller PCB. The controller includes a first
output (LEDR) that drives the red-emitting LEDs in the dual-color
LEDs and includes a second output (LEDG) that drives the
green-emitting LED in the dual-color LEDs. A first current limiting
resistor 980 couples the first output to the anodes of the
red-emitting LEDs in a first set of three dual-color LEDs. A second
current limiting resistor 982 couples the second output to the
anodes of the green-emitting LEDs in the first set of three
dual-color LEDs. A third current limiting resistor 984 couples the
first output to the anodes of the red-emitting LEDs in a second set
of three dual-color LEDs. A fourth current limiting resistor 986
couples the second output to the anodes of the green-emitting LEDs
in the second set of three dual-color LEDs.
In the illustrated embodiment, the dual-color LEDs 260 are driven
with different duty cycles to indicate the present state of charge
of the battery unit 214. For example, in a first state, the first
output (LEDR) of the controller 860 is driven with a 100 percent
duty cycle and the second output (LEDG) of the controller is not
driven such that only the red-emitting LEDs are illuminated to
indicate that the battery unit needs be charged. In a second state,
the first output is driven with a 75 percent duty cycle and the
second output is driven with a 25 percent duty cycle such that the
resulting perceived color is a mixture of red and green. In a third
state, the first output and the second output are both driven with
a respective 50 percent duty cycle. In a fourth state, the first
output is driven with a 25 percent duty cycle and the second output
is driven with a 75 percent duty cycle. In a fifth state, the first
output is not driven and the second output is driven with a 100
percent duty cycle such that the color is entirely green to
indicate that the battery unit is at or near a fully charged state.
The duty cycles at which the two outputs are driven may be
interleaved such that the two outputs are not on at the same time.
Other than at the first state, the duty cycles are repeated at a
rate sufficiently high that the enabled LEDs appear to be on at all
times without a perceptible flicker. When the battery controller is
in the first state, the battery controller may blink the
red-emitting LEDS on and off at a perceptible rate to remind the
user that the charge on the battery is low and should be charged
before continuing to use the percussive massage applicator 100. In
certain embodiments, the first state may be further segmented into
two charge ranges. In a first range of charges within the first
state, the red LEDs are driven with a constant illumination to
indicate that the charge on the charge on the battery unit is low
and that the battery unit should be charged soon. In a second range
of charges, the red LEDs are blinked to indicate that the charge in
the battery unit is very low and that the battery unit should be
charged promptly.
FIG. 24 illustrates an exemplary motor controller circuit 1000,
which comprises in part the circuitry mounted on the motor
controller PCB 160. In FIG. 24, previously identified elements are
numbered with like numbers as before. As described above, the
battery assembly 132 provides the positive battery output voltage
VOUT on the first leaf spring contact 204A of the receiving tray
200 when the battery assembly is inserted into the receiving tray.
The positive battery output voltage is identified as VBAT in FIG.
24. The CHRG signal from the battery assembly is provided to the
second leaf spring contact 204B when the battery assembly is
inserted into the receiving tray. The battery ground (GND) is
provided to the third leaf spring contact 204C when the battery
assembly is inserted into the receiving tray. The DC voltage, the
battery ground and the CHRG signal are coupled via a three-wire
cable 1010 to a cable jack 1012. The first plug 170 on the motor
controller PCB plugs into the cable jack to receive the DC voltage
on a first pin 1020, to receive the CHRG signal on a second pin
1022, and to receive the battery ground (GND) on a third pin 1024.
The battery ground (GND) from the third pin of the first plug is
electrically connected to a local circuit ground 1026.
The DC voltage (VBAT) on the first pin 1020 of the first plug 170
is filtered by a filter capacitor 1030 connected between the first
pin of the first plug and the local circuit ground 1026. The DC
voltage is also provided to a first terminal of a current limiting
resistor 1032. A second terminal of the current limiting resistor
is provided to the voltage input terminal of a voltage regulator
1040. The voltage regulator receives the battery voltage and
converts the battery voltage to 5 volts. The 5-volt output of the
voltage regulator is provided on a local VCC bus 1042. The local
VCC bus is filtered by a filter capacitor 1044, which is connected
between the local VCC bus and the local circuit ground. In the
illustrated embodiment, the voltage regulator is a 78L05
three-terminal regulator, which is commercially available from a
number of manufacturers, such as, for example, National
Semiconductor Corporation of Santa Clara, Calif.
The CHRG signal on the second pin 1022 of the first plug 170 is
provided to a charge (CHRG) input of a motor controller 1050 via a
series resistor 1052. The charge input to the motor controller is
filtered by a filter capacitor 1054. The motor controller receives
the 5-volt supply voltage from the VCC bus 1042
The DC voltage from the first pin 1020 of the first plug is also
provided directly to a first pin 1060 of the five-pin second plug
172. The second plug 172 is connectable to a second jack 1070
having a corresponding number of contacts. The second jack is
connected via a five-wire cable 1072 to the motor 310.
A second pin 1080 of the second plug is a tachometer (TACH) pin,
which receives a tachometer signal from the motor 310 indicative of
the present angular velocity of the motor. For example, the
tachometer signal may comprise one pulse for every revolution of
the shaft 312 of the motor or one pulse per partial revolution. The
tachometer signal is provided to a first terminal of a first
resistor 1084 in a voltage divider circuit 1082. A second terminal
of the first resistor is connected to a first terminal of a second
resistor 1086 in the voltage divider circuit. A second terminal of
the second resistor is connected to the local circuit ground. A
common node 1088 between the first and second resistors in the
voltage divider circuit is connected to the base of an NPN bipolar
transistor 1090. An emitter of the NPN transistor is connected to
ground. A collector of the NPN transistor is connected to the VCC
bus 1042 via a pull-up resistor 1092. The NPN transistor inverts
and buffers the tachometer signal from the motor and provides the
buffered signal to a TACH input of the motor controller. The
buffered signal varies between +5 volts (VCC) and the local circuit
ground potential when the tachometer signal varies between the
local circuit ground potential and the DC voltage potential from
the battery.
A third pin 1100 of the second plug 172 is a
clockwise/counterclockwise (CW/CCW) signal generated by the motor
controller 1050 and coupled to the third pin via a current limiting
resistor 1102. The state of the CW/CCW signal determines the
rotational direction of the motor 310. In the illustrated
embodiment, the CW/CCW signal is maintained at a state to cause
clockwise rotation; however, the rotation can be changed to the
opposite direction in other embodiments.
A fourth pin 1110 of the second plug 172 is connected to the local
circuit ground 1026, which corresponds to the battery ground
connected to the negative terminal of the battery unit 214 in FIG.
23.
A fifth pin 1120 of the second plug 172 receives a pulse width
modulation (PWM) signal generated by the motor controller 1050. The
PWM signal is coupled to the fifth pin via a current limiting
resistor 1122. The motor 310 is responsive to the duty cycle and
the frequency of the PWM signal to rotate at a selected angular
velocity. As described below, the motor controller controls the PWM
signal to maintain the angular velocity at one of three selected
rotational speeds.
The motor controller 1050 has a switch-in (SWIN) input that
receives an input signal from the pushbutton switch 162. The
pushbutton switch has a first contact connect to the local circuit
ground 1026 and has a second contact connected to the VCC bus 1042
via a pull-up resistor 1130. The second contact is also connected
to the local circuit ground via a filter capacitor 1132. The second
is also connected to the SWIN input of the motor controller. The
input signal is held high by the pull-up resistor until the switch
contacts are closed by actuating the pushbutton switch. When the
switch is actuated to close the contacts, the input signal is
pulled to 0 volts (e.g., the potential on the local circuit
ground). The filter capacitor reduces the switch contact bounce
noise. The motor controller may include internal debounce circuitry
to eliminate the effects of the switch contact bounce. The motor
controller is initialized in an off state wherein no PWM signal is
provided to the motor 310, and the motor does not rotate. The motor
controller is responsive to a first activation of the switch to
advance from the off-state to a first on-state wherein the PWM
signal provided to the motor is selected to cause the motor to
rotate at a first (low) speed. A subsequent activation of the
switch advances the motor controller to a second on-state wherein
the PWM signal provided to the motor is selected to cause the motor
to rotate at a second (medium) speed. A subsequent activation of
the switch advances the motor controller to a third on-state
wherein the PWM signal provided to the motor is selected to cause
the motor to rotate at a third (high) speed. A subsequent
activation of the switch returns the motor controller to the
initial off-state wherein no PWM signal is provided to the motor
and the motor does not rotate. In the illustrated embodiment, the
three rotational speeds of the motor are 2,000 rpm (low), 2,600 rpm
(medium) and 3,000 rpm (high).
The motor controller 1050 generates a nominal PWM signal associated
with the currently selected on-state (e.g., low, medium or high
speed). Each on-state corresponds to a selected rotational speed as
described above. The motor controller monitors the tachometer
signal (TACH) received from the pin 1080 of the five-pin plug 172
via the voltage divider 1082 and the NPN transistor 1090. If the
received tachometer signal indicates that the motor speed is below
the selected speed, the motor controller adjusts the PWM signal
(e.g. increases the pulse width or increases the repetition rate or
both) to increase the motor speed. If the received tachometer
signal indicates that the motor speed is above the selected speed,
the motor controller adjusts the PWM signal (e.g. decreases the
pulse width or decreases the repetition rate or both) to decrease
the motor speed.
The motor controller 1050 generates a first set of three LED
control signals (LEDS1, LEDS2, LEDS3). The first signal (LEDS1) in
the first set is coupled via a current limiting resistor 1150 to
the first speed indication LED 166A. The first signal in the first
set is activated to illuminate the first speed indication LED when
the motor controller is in the first on-state to drive the motor at
the first (low) speed. The second signal (LEDS2) in the first set
is coupled via a current limiting resistor 1152 to the second speed
indication LED 166B. The second signal in the first set is
activated to illuminate the second speed indication LED when the
motor controller is in the second on-state to drive the motor at
the second (medium) speed. The third signal (LEDS3) in the first
set is coupled via a current limiting resistor 1154 to the third
speed indication LED 166C. The third signal in the first set is
activated to illuminate the third speed indication LED when the
motor controller is in the third on-state to drive the motor at the
third (high) speed.
The motor controller 1050 is further responsive to the CHRG signal
from the input plug 170. As discussed above, the CHRG signal is
generated by the battery charger controller 860 to indicate the
state of charge of the battery unit 214. The motor controller
determines the present state of charge of the battery unit from the
CHRG input signal and displays the state of charge on the five
battery charge state LEDs 168A, 168B, 168C, 168D, 168E which are
visible through the main body endcap 140. The motor controller
generates a second set of five LED control signals (LEDC1, LEDC2,
LEDC3, LEDC4, LEDC5). The first signal (LEDC1) in the second set is
coupled via a current limiting resistor 1170 to the first charge
LED 168A. The first signal in the second set is activated to
illuminate the first charge indication LED when the battery unit
has a lowest range of charge. The motor controller may blink the
first charge indication LED at a perceptible rate to indicate the
lowest range of charge. The color (e.g., red) of the light emitted
by the first charge LED may differ from the color (e.g., green) of
the light emitted by the other LEDS to further indicate the lowest
range of charge (e.g., no more than 20 percent of charge
remaining). The second signal (LEDC2) in the second set is coupled
via a current limiting resistor 1172 to the second charge
indication LED 168B. The second signal in the second set is
activated to illuminate the second charge indication LED when the
battery unit has a second range of charge (e.g., 21-40 percent of
charge remaining). The third signal (LEDC3) in the second set is
coupled via a current limiting resistor 1174 to the third charge
indication LED 168C. The third signal in the second set is
activated to illuminate the third charge indication LED when the
battery unit has a third range of charge (e.g., 41-60 percent of
charge remaining). The fourth signal (LEDC4) in the second set is
coupled via a current limiting resistor 1176 to the fourth charge
indication LED 168D. The fourth signal in the second set is
activated to illuminate the fourth charge indication LED when the
battery unit has a fourth range of charge (e.g., 61-80 percent of
charge remaining). The fifth signal (LEDC5) in the second set is
coupled via a current limiting resistor 1178 to the fifth charge
indication LED 168B. The fifth signal in the second set is
activated to illuminate the fifth charge indication LED when the
battery unit has a fifth range of charge (e.g., 81-100 percent of
charge remaining). It should be understood that the ranges of
charge are only approximations and are provided as examples.
The portable electromechanical percussive massage applicator 100
described herein advantageously allows a massage therapist to
effectively apply percussion massage over an extended time duration
without excessive tiring and without being tethered to an
electrical power cord. The reduced noise level of the portable
electromechanical percussive massage applicator described herein
allows the device to be used in quiet environment such that the
person being treated with the device is able to relax and enjoy any
ambient music or other soothing sounds provided in the treatment
room.
As various changes could be made in the above constructions without
departing from the scope of the invention, it is intended that all
the matter contained in the above description or shown in the
accompanying drawings shall be interpreted as illustrative and not
in a limiting sense.
* * * * *